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Related Concept Videos

Immunoprecipitation01:20

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Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
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Related Experiment Video

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A Fluorescence-based Assay of Phospholipid Scramblase Activity
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Opalescence Arising from Network Assembly in Antibody Solution.

Yoshitaka Nakauchi1, Suguru Nishinami1, Yusuke Murakami2,3

  • 1Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8573, Ibaraki, Japan.

Molecular Pharmaceutics
|March 11, 2022
PubMed
Summary

Therapeutic antibody solutions can become opalescent due to network assemblies, not precipitates. Stabilizers like trehalose and arginine effectively suppress this antibody opalescence in drug formulations.

Keywords:
additiveantibodyliquid−liquid phase separationnetwork assemblyopalescence

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Area of Science:

  • Biochemistry
  • Pharmaceutical Sciences
  • Protein Chemistry

Background:

  • Opalescence in therapeutic antibody solutions is a formulation challenge.
  • The underlying mechanisms of antibody solution opalescence are not fully understood.

Purpose of the Study:

  • To investigate the assembly states of antibody molecules at varying concentrations.
  • To elucidate the mechanism behind antibody solution opalescence.

Main Methods:

  • Studied bovine gamma globulin and human immunoglobulin G solutions.
  • Analyzed antibody solutions at concentrations around 100 mg/mL.
  • Observed the effects of trehalose and arginine on opalescence.

Main Results:

  • Formation of submicron-scale network assemblies observed in antibody solutions.
  • Network assembly caused opalescence with a blue hue, without antibody precipitation.
  • Trehalose and arginine addition suppressed opalescence caused by network assembly.

Conclusions:

  • Antibody solution opalescence arises from network assembly, not precipitation.
  • Stabilizers can mitigate opalescence in antibody formulations.
  • Findings aid in evaluating and enhancing protein drug formulations.